Telephone



April 11, 1933.

K. PAREL TELEPHONE Filed July 22, 1930 ww f Patented Apr. 11, 193?;

umrso KARL .PAREL, OF VIENNA, AUSTRIA, ASSIGNOR TO TELEPHON- "UN'D TELEGRAPHEN- FABRIKS-A. G. KAPSGH U. S5HNE, 0F VIENNA, AUSTRIA, A COMPANY OF AUSTRIA TELEPHONE Application filed July 22, 1930, Serial No. 469,865, and in Germany May 5, 1930.

In the known micro-telephones of pressed material extensions are provided at both ends of the handle, which as a rule have box-like recesses in which the microphone and receiver cases are completely or partially sunk and are held in position by fiat, screwed-on covers. The production of the handle with the hollow extensions is costly and the terminals and contact springs at the bottom of the recess are difficult of access. Furthermore the con necting cord has to be introduced through a hole from below into the box-shaped extension. For simplifying the manufacture it has been proposed to screw on to the extensions of the handle box-like casings for the microphone and the receiver and to close these casings by fiat covers. In that case, however, the micro telephone consists of five parts (handle, two boxes, two covers), is therefore costly and has its connections so as to be not easily accessible at the bottom of the casings.

In order to make the manufacture of the handle less costly, according to the invention the extensions at either end of the handle are notprovided with box-like recesses, but are made in the form of compact raised extensions, on the flat upper side of which the 1 connecting terminals and contact springs are disposed next to one another so as to be easily accessible. The connecting cord can then be embedded at the side of the microphone in a groove in the flat surface of the extension, so as to be easily lifted out. As the microphone and the receiver would lie exposed on the flat extensions, the covers or caps must be made box=shaped and of such a depth that the whole of the microphone and the whole of the receiver find room therein and are completely enclosed by them.

Thus, according to the invention there is a reversal of the arrangement hitherto used, in the sense that the microphone and the receiver are not embedded in boxes at the handle ends, but in the deeply recessed caps, the handle ends acting only as the bases for these box-like caps.

Figs. 1 and2 of theaccompanying drawing show such a micro-telephone in longitudinal section and in front elevation with the caps removed. Fig.3 is a front View of the receiver. V

' The handle 31 of the micro-telephone is provided with raisedflat extensions 32, 33, which are provided with screw-threads for the reception of screw-threaded box-like caps 36, 37. In view of the raised flat extension 32,-the receiver can be securely fastened in different ways. For instance this may be carried out by securing to the armature two springy contact-pins 41, 41, to which are secured the two connecting wires 40, located in the handle 31 and onto which is pushed the microphone 28 shownin Fig. 3, The magnets 43' are connected with'the poleshoes 44, 44 and the casing 38 by means of insulated eyes 42, 42. The end of the coilwires are soldered to the ears 45, 45 which are secured by the eyes. The pins 41, 41 fit tightly into the eyes 42, 42 and therefore when assembling the parts, the microphone is placed onto the pins 41, 41 and subsequently the cap 36 is screwed onto the said handle-extension 32. Also the magnets and pole-shoes are secured to the casing by insulated pins and the connecting wires 40, 40 pass along sleeves in the extension 32 or, if desired, the microphone can be secured by screws, whereby the ends of the coils are connected to the insulated screws or to the ends of the connecting wires 40, 40, which extend into the microphone by way of openings in the bottom of the casing and are soldered to the coilwires. As will be described hereinafter, similar springs may be arranged on the extension 32 and the casing can be pressed onto these springs by way of an annular extension in the interior of the earpiece.

Preferably a microphone 46 of usual construction is used. The connecting cable is embedded in a groove 47 of the extension 33. to which are screwed screws 48, 49, 50, re: lieved of any tension by an angle-bracket 51. Two contact-springs 52, 53 establish contact with the microphone. The screw-threaded box-like cap 37 is screwed to the extension 33. and provided with openings for the passage of the sound waves. An annular rest 54 in the cap serves to hold the microphone along its entire outside and to press the latter onto the two contact-springs 52, 53 when screwing on the cap 37 The assemblage is carried out in that the microphone is inserted in the cap in the correct position and thereafter the latter with the microphone therein is screwed onto the handle-extension 33. Of course the microphone can be fixed also in any other manner, for instance by pins or screws as in the case of the receiver;

If desired also a ring 55 for suspending the microphone can be secured to it in a most simple manner for instance by two screws 56, 57.

1. A micro-telephone of pressed material, comprisinga handle with raised, flat extensions at either end of the handle, with easily accessible terminals, contact pins and contact springs for transmitter and receiver on the flat faces of the said extensions and with deeply recessed, box-shaped caps which are screwed on to the said extensions and completely surround the transmitter and the receiver.

2. A micro-telephone of pressed material, comprising a handle with raised, flat extensions at either end of the handle and with a groove for the connecting cable on the face of one of the two extensions.

In testimony whereof I aifix my signature.

KARL PAREL. 

